A guy has told me ‘I’m his sexual fantasy’?

Context.. I started speaking to a guy online, he was helping me with a project in a group chat, I went to him with any and all questions & he was super helpful. We became friends and occasionally messaged the ‘hey how are you’ he started to take an interest in my personal life (family, work, giving advice etc) but overall most contact was in regards to our hobby. Well today, he said to me that I was his ‘sexual fantasy’ and ‘he wants me’. We are both in long term relationships & have never met. This is rather confusing and I’m not sure how to handle this situation, can our friendship continue?

A guy has told me ‘I’m his sexual fantasy’?
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